Dear Friends, 

    My name is Santhosh from India. I am new to this group just now joined. I am using Laptop operating system is Windows 7, for the past 3 days symantech is showing errors like "Malware is not funtioning correctly. Your protection definitions may be damaged or your product installation may be corrupt". Due to this problem my laptop is hanging a bit. Kindly provide me the exact solution to solve this issue.

check this link

http://www.symantec.com/business/support/index?page=content&id=TECH102962

This can happen if files in the installed product become corrupted.

To solve the problem, uninstall and reinstall Symantec Endpoint Protection.  To take advantage of the latest enhancements, fixes and improvements, please install the latest available release of the SEP client

How to clear out corrupted definitions for a Symantec Protection Center and Symantec Endpoint Protection Client manually

Dear Friend,

     No I din't remove yet. Version is 12.1

You can reinstall sep client and Installed latest SEP 12.1.4 MP1.

Dear Mr.James

     Thanks I"ll do that and revert you back. Let us hope this issue will be solved soon.

Hello Guys,

     I have uninstalled and installed the exact name is Symantec endpoint protection client but at last step while installing "the wizard was interrupted before Endpoint protection client could be compeletely installed. Your system has not been modified, To complete installed at another time." 

This means whether the files are not there or windows 7 has any problem to installed. OS - Windows 32-bit version.

Did you try to uninstall SEP client using Cleanwipe tool ?  Did you try intallation local admin account ? Does you have disabled UAC and Windows Defender ?

Please post SEP_INST.log and SIS_INST.log

Dear James,

    I have totally uninstalled no tool I used then yes disabled UAC and Windows Defender, but local admin account i din't get. Then as you said what is the last line mention post means where can I find that or have to create that how to create log file?

Does you id having admin rights ?

SEP_INST.log available in %Temp%

SIS_INST.LOG is located at the following location:
C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint Protection\12.1.XXXX\Data\Install\Logs

Run the synehlp tool on it to check for issues

Troubleshooting computer issues with the Symantec Help support tool

Check your windows defender service, disable it and run the install

something like this

https://www-secure.symantec.com/connect/forums/cannot-install-sep-client-windows-7-64-bit

Could you post the SEP_INST & SIS_INST logs for further analysis. This would really help us to find the cause of the rollback. 

Remove the client with Cleanwipe tool.

Install the client again. If any issue come then post the sep_inst.log here from %temp%.